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pCO2 measurements in the Baltic Sea on M/S Tavastland
Anna Willstrand Wranne1
Bengt Karlson1, Kristin Andreasson1, Johan Kronsell1, Magnus Wenzer1, Ola Kalen1, Fredrik
Waldh1, Jens Müller2
1Swedish Meteorological and Hydrological Institute,
Sven Källfelts gata 15, SE-426 71 Västra Frölunda, Sweden
2Leibniz-Institut für Ostseeforschung Warnemünde, IOW, Germany
9th Ferrybox Workshop, Genua24-26th April 2019
FerryBox on M/S Tavastland
In water, 3 m depth
• Flow rate
• Temperature, SBE38
• Temperature, SBE45
• Salinity, SBE45
• Oxygen, Aanderaa
• Chlorofyll fluorescence, Wetlabs
• Phycocyanin fluorescence, Trios
• CDOM fluorescence, Trios
• pCO2, General Oceanics
In air
• Temperature
• Air pressure
• Irradiation, PAR
• CO2
Sampling frequency is every 20 sec for most parameters.
Tavastland parameters
Operating between
Lubeck-Oulu-Kemi
and back, every week
General Oceanics 8050
Installed on M/S Tavastland
2010
Part of a Ocean Acidification
Project
funded by Naturvårdsverket
during a 3 year period.
Collaboration between SMHI
and University of Gothenburg.
pCO2 system on Tavastland
CO2-reference gases: 0, 200, 400, 700 ppm
The system have an equilibrator that balances the CO2 in seawater with a
headspace gas that is analysed.
The gas goes through drying tubes and discs to dry the gas before the Non-
Dispersive Infra-Red Analyser (LICOR) that only measures on dry gas.
Results ferrybox: salinity and temperature 2018
Results ferrybox: chl a fuorescence 2018
4 August 2018, Sentinel 3A,
OLCI, processed by SMHI
16 July 2018, Sentinel 3A,
OLCI, processed by SMHI
Results pCO2 2018
GO system shut down due to old
computer that did not restart after
power shut down.
Problem with data collection from
the ferrybox.
Conclusions about results from year 2018
Unusual conditions
Warm summer
Long duration of
cyanobacteria bloom
pCO2
GO-system running during
large part of the year
High pCO2 in Feb. - March
before spring bloom
pCO2 reduction due to high
photosynthesis later in the
year
Comparison Tavastland and Finnmaid
• Finnmaid ferrybox:
Basic system similar to
Tavastland due to same
designer – SYKE.
• Part of ICOS-D
• Operating between Lübeck and
Helsinki and back ~ every 3
days
• Part of Alg@line project
(SYKE)
• Instrumentation for pCO2,
pCH4, pO2 operated by IOW
Comparison Tavastland and Finnmaid 2018-06-02
Tavastland
Finnmaid
Comparison Tavastland and Finnmaid 2018-06-02
Salinity
pCO2
Acknowledgment:
Crew on Tavastland
Thank you!
Questions?